Abstract: An electro-pneumatic air-horn assembly comprises a horn assembly, an electrically powered air-compressor assembly, a mounting bracket, and a rigid metal conduit. The horn assembly includes an elongated trumpet. The air-compressor assembly is adapted to provide air to the horn assembly. The mounting bracket is adapted to support the air-compressor assembly and the horn assembly and mount the air-horn assembly to a vehicle. The mounting bracket includes an upper portion operatively attached to the air-compressor assembly, a lower portion operatively attached to the horn assembly, and an elbow transition extending between the upper and lower portions. The rigid metal conduit extends between the air-compressor assembly and the horn assembly to provide fluid communication therebetween. The horn assembly, air-compressor assembly, mounting bracket, and conduit are pre-assembled and adapted to be mounted directly to the vehicle as a unit.